Symeon 7 was a monk, priest and hegoumenos of the monastery of the Chora at Constantinople; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and is attested at the second and fourth sessions, on 26 September and 1 October 787: Mansi XII 1111 (Συμεὼν ὁ εὐλαβέστατος ἡγούμενος τῆς Χώρας), XIII 68 (Συμεὼν ὁ εὐλαβέστατος μοναχὸς πρεσβύτερος καὶ ἡγούμενος τῆς Χώρας), XIII 152 (Συμεὼν ἡγούμενος τῆς Χώρας). At the second session he supported the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1): Mansi XII 1111. At the fourth session he produced a codex from which was read to the Council a passage from a sermon of John Chrysostom: Mansi XIII 68. Later he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 152.

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